我刚试过这个，它运行正常。

I just tested this and it works fine.

在您的代码中，您将文本视图添加到子视图。相反，您应该将其添加到滚动视图。

In your code, you are adding the text view to the subview. Instead, you should be adding it to the scroll view.

子视图什么都不做，只提供红色。您可以通过调用

The subview does nothing, just provide the red color. You can send it to the back by calling

[self.scrollView bringSubviewToFront:textView];

PS：别忘了调整 x labelFrame 到 subview.frame.size.width +10 。 ; - ）

PS: Don't forget to adjust the x of labelFrame to subview.frame.size.width +10. ;-)